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While availability of new pi4 is complicated, you can easily find them on the second hand market as well as myriads of 2, 3B, 3B+ and zero variants.

Also, as said by previous answer, many alternatives have the same gpio.

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Yes, we have also tested the HAT and software on Odroid C1 and Banana Pi. The problem is that you need to have one of each SBC to compile the software and test it - some of the GPIO pins do not match the Pi scheme, so have to be remapped.

We managed to secure a bulk supply of Pi 3B+, so that suits our market.

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